/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.http.multipart;

import io.netty.buffer.ByteBuf;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

/**
 * Mixed implementation using both in Memory and in File with a limit of size
 */
public class MixedFileUpload implements FileUpload
{

    private FileUpload fileUpload;

    private final long limitSize;

    private final long definedSize;

    private long maxSize = DefaultHttpDataFactory.MAXSIZE;

    public MixedFileUpload(String name, String filename, String contentType,
            String contentTransferEncoding, Charset charset, long size,
            long limitSize)
    {
        this.limitSize = limitSize;
        if (size > this.limitSize)
        {
            fileUpload = new DiskFileUpload(name, filename, contentType,
                    contentTransferEncoding, charset, size);
        }
        else
        {
            fileUpload = new MemoryFileUpload(name, filename, contentType,
                    contentTransferEncoding, charset, size);
        }
        definedSize = size;
    }

    @Override
    public long getMaxSize()
    {
        return maxSize;
    }

    @Override
    public void setMaxSize(long maxSize)
    {
        this.maxSize = maxSize;
        fileUpload.setMaxSize(maxSize);
    }

    @Override
    public void checkSize(long newSize) throws IOException
    {
        if (maxSize >= 0 && newSize > maxSize)
        {
            throw new IOException("Size exceed allowed maximum capacity");
        }
    }

    @Override
    public void addContent(ByteBuf buffer, boolean last) throws IOException
    {
        if (fileUpload instanceof MemoryFileUpload)
        {
            checkSize(fileUpload.length() + buffer.readableBytes());
            if (fileUpload.length() + buffer.readableBytes() > limitSize)
            {
                DiskFileUpload diskFileUpload = new DiskFileUpload(
                        fileUpload.getName(), fileUpload.getFilename(),
                        fileUpload.getContentType(),
                        fileUpload.getContentTransferEncoding(),
                        fileUpload.getCharset(), definedSize);
                diskFileUpload.setMaxSize(maxSize);
                ByteBuf data = fileUpload.getByteBuf();
                if (data != null && data.isReadable())
                {
                    diskFileUpload.addContent(data.retain(), false);
                }
                // release old upload
                fileUpload.release();

                fileUpload = diskFileUpload;
            }
        }
        fileUpload.addContent(buffer, last);
    }

    @Override
    public void delete()
    {
        fileUpload.delete();
    }

    @Override
    public byte[] get() throws IOException
    {
        return fileUpload.get();
    }

    @Override
    public ByteBuf getByteBuf() throws IOException
    {
        return fileUpload.getByteBuf();
    }

    @Override
    public Charset getCharset()
    {
        return fileUpload.getCharset();
    }

    @Override
    public String getContentType()
    {
        return fileUpload.getContentType();
    }

    @Override
    public String getContentTransferEncoding()
    {
        return fileUpload.getContentTransferEncoding();
    }

    @Override
    public String getFilename()
    {
        return fileUpload.getFilename();
    }

    @Override
    public String getString() throws IOException
    {
        return fileUpload.getString();
    }

    @Override
    public String getString(Charset encoding) throws IOException
    {
        return fileUpload.getString(encoding);
    }

    @Override
    public boolean isCompleted()
    {
        return fileUpload.isCompleted();
    }

    @Override
    public boolean isInMemory()
    {
        return fileUpload.isInMemory();
    }

    @Override
    public long length()
    {
        return fileUpload.length();
    }

    @Override
    public long definedLength()
    {
        return fileUpload.definedLength();
    }

    @Override
    public boolean renameTo(File dest) throws IOException
    {
        return fileUpload.renameTo(dest);
    }

    @Override
    public void setCharset(Charset charset)
    {
        fileUpload.setCharset(charset);
    }

    @Override
    public void setContent(ByteBuf buffer) throws IOException
    {
        checkSize(buffer.readableBytes());
        if (buffer.readableBytes() > limitSize)
        {
            if (fileUpload instanceof MemoryFileUpload)
            {
                FileUpload memoryUpload = fileUpload;
                // change to Disk
                fileUpload = new DiskFileUpload(memoryUpload.getName(),
                        memoryUpload.getFilename(),
                        memoryUpload.getContentType(),
                        memoryUpload.getContentTransferEncoding(),
                        memoryUpload.getCharset(), definedSize);
                fileUpload.setMaxSize(maxSize);

                // release old upload
                memoryUpload.release();
            }
        }
        fileUpload.setContent(buffer);
    }

    @Override
    public void setContent(File file) throws IOException
    {
        checkSize(file.length());
        if (file.length() > limitSize)
        {
            if (fileUpload instanceof MemoryFileUpload)
            {
                FileUpload memoryUpload = fileUpload;

                // change to Disk
                fileUpload = new DiskFileUpload(memoryUpload.getName(),
                        memoryUpload.getFilename(),
                        memoryUpload.getContentType(),
                        memoryUpload.getContentTransferEncoding(),
                        memoryUpload.getCharset(), definedSize);
                fileUpload.setMaxSize(maxSize);

                // release old upload
                memoryUpload.release();
            }
        }
        fileUpload.setContent(file);
    }

    @Override
    public void setContent(InputStream inputStream) throws IOException
    {
        if (fileUpload instanceof MemoryFileUpload)
        {
            FileUpload memoryUpload = fileUpload;

            // change to Disk
            fileUpload = new DiskFileUpload(fileUpload.getName(),
                    fileUpload.getFilename(), fileUpload.getContentType(),
                    fileUpload.getContentTransferEncoding(),
                    fileUpload.getCharset(), definedSize);
            fileUpload.setMaxSize(maxSize);

            // release old upload
            memoryUpload.release();
        }
        fileUpload.setContent(inputStream);
    }

    @Override
    public void setContentType(String contentType)
    {
        fileUpload.setContentType(contentType);
    }

    @Override
    public void setContentTransferEncoding(String contentTransferEncoding)
    {
        fileUpload.setContentTransferEncoding(contentTransferEncoding);
    }

    @Override
    public void setFilename(String filename)
    {
        fileUpload.setFilename(filename);
    }

    @Override
    public HttpDataType getHttpDataType()
    {
        return fileUpload.getHttpDataType();
    }

    @Override
    public String getName()
    {
        return fileUpload.getName();
    }

    @Override
    public int hashCode()
    {
        return fileUpload.hashCode();
    }

    @Override
    public boolean equals(Object obj)
    {
        return fileUpload.equals(obj);
    }

    @Override
    public int compareTo(InterfaceHttpData o)
    {
        return fileUpload.compareTo(o);
    }

    @Override
    public String toString()
    {
        return "Mixed: " + fileUpload;
    }

    @Override
    public ByteBuf getChunk(int length) throws IOException
    {
        return fileUpload.getChunk(length);
    }

    @Override
    public File getFile() throws IOException
    {
        return fileUpload.getFile();
    }

    @Override
    public FileUpload copy()
    {
        return fileUpload.copy();
    }

    @Override
    public FileUpload duplicate()
    {
        return fileUpload.duplicate();
    }

    @Override
    public FileUpload retainedDuplicate()
    {
        return fileUpload.retainedDuplicate();
    }

    @Override
    public FileUpload replace(ByteBuf content)
    {
        return fileUpload.replace(content);
    }

    @Override
    public ByteBuf content()
    {
        return fileUpload.content();
    }

    @Override
    public int refCnt()
    {
        return fileUpload.refCnt();
    }

    @Override
    public FileUpload retain()
    {
        fileUpload.retain();
        return this;
    }

    @Override
    public FileUpload retain(int increment)
    {
        fileUpload.retain(increment);
        return this;
    }

    @Override
    public FileUpload touch()
    {
        fileUpload.touch();
        return this;
    }

    @Override
    public FileUpload touch(Object hint)
    {
        fileUpload.touch(hint);
        return this;
    }

    @Override
    public boolean release()
    {
        return fileUpload.release();
    }

    @Override
    public boolean release(int decrement)
    {
        return fileUpload.release(decrement);
    }
}
